Pump unit



Aug. 12, 1952 R. R. WITHERELL PUMP UNIT 2 sHEETs -sl-iEET 1 Filed Oct. 28, 1946 1952 R. R. WITHERELL v 2,606,498

PUMP UNIT 2 SHEETS-SHEET 2 Filed Oct. 28, 1946 INVENTOR. 770Za/f 77 WZig/aZZ Patented Aug. 12, 1952 PUMP UNIT Robert R. Witherell, Bloomington, Ill., assignor to Eureka Williams Corporation, Detroit, Mich., a corporation of Michigan Application October 28, 1946, Serial No. 706,139

21 Claims.

This invention relates to oil burners and has particular reference to a new and improved pump construction for supplying oil to the nozzle of the burner.

In low pressure type oil burners, it is important that accurate quantities of oil be fed to the nozzle of the burner. This invention contemplates a novel pump construction particularly adapted to form a part of a low pressure type oil burner and which pump construction is designed to supply metered quantities of oil to the nozzle of the burner. The pump construction includes provisions whereby the output of the pump may be adjusted in order to vary the capacity of the burner.

A principal object of the invention is to provide a new and improved pump construction which is particularly adapted for use as a part of a low pressure type oil burner.

Another object of the invention is to provide a new and improved adjustable metering pump construction for an oil burner and which pump is constructed so as to pump accurately metered quantities of oil to the nozzle of the burner.

Another object of the invention is to provide a metering pump construction for an oil burner in which the pump functions as a shutoff valve between the oil supply to the pump and the discharge therefrom.

Another object of the invention is to provide a pump unit for an oil burner incorporating a suction pump and a metering pump and in which the suction pump forms a part of the metering pump. 7

Other and further objects of the invention will be apparent from the following description and claims and will be understood by reference to the accompanying drawings, of which there are two sheets, which, by way of illustration, show a preferred embodiment and the principles thereof and what I now consider to be the best mode in which I have contemplated applying those principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims. Ialso contemplate that of the several different features of my invention, certain ones thereof may be advantageously employed in some applications separate and apart from the remainder of the features.

In the drawings:

Fig. 1 is an elevational view of a pump unit embodying the invention;

Fig. 2 is a longitudinal sectional view thereof Fig. 3 is a fragmentary sectional view taken along the line 3-3 of Fig. 2;

Fig. 4 is an enlarged sectional view taken on the line 4-4 of Fig. 2, looking in the direction of the arrows;

Fig. 5 is a fragmentary end elevational view of the pump unit illustrating the means by which the capacity of the pump may be adjusted;

Fig. 6 is a view similar to Fig. 4, but showing the metering pump parts arranged so that the capacity of the pump is greater than as shown in Fig. 4; and

Fig. 7 is a fragmentary sectional view on a reduced scale taken along the line 'I- -"I of Fig. 4.

The pump unit in general comprises a rotary vane type air pump indicated generally at 10, a gear type suction pump indicated generally at I2 and an oscillating reciprocating type of oil metering pump indicated generally at 14. The pump construction is adapted for use in an oil burner assembly of the type shown in Williams, Patent No. 1,934,755, issued November 14, 1933, for Burner Assembly, and also is adapted to form a part of an oil burner as disclosed in my copending application, Serial No. 701,641, filed October 7, 1946, for Oil Burners, now Patent No. 2,484,920, granted October 18, 1949.

The pump unit more particularly comprises a casing I6 having formed therein chambers l8 and 20. The chambers l8 and 20 are cylindrical and intersect each other, as shown more clearly in Fig. 4, and form a part of the oil metering pump l4; Such pump further includes a cylinder member 22 arranged for oscillation or gymtion in the chamber I8 and having a cylinder 24 therein. The cylinder member 22 is provided with a laterally projecting stem 26 which is arranged normal to the plane of the member 22 and to the axis of the cylinder 24 therein. A rotary shaft 28 is journaled in the casing l6 and has a bore 30 in which the stem 26 is rotatably mounted. A ball thrust member 32 is arranged between the bottom of the bore 30 and the stem 26. The axis of the bore 36 and of the stem 26 is arranged parallel to, but offset from the axis of the shaft 28 so that during the rotation of the shaft 28, the cylinder member 22 will oscillate or gyrate about the axis of the shaft 28.

The surface or end wall 34 of the chamber I8 is provided with two spaced fluid flow ports 36 and 38, one of which forms a port through which oil is supplied to the pump cylinder 24, while the other of which forms a port through which oil is discharged from the pump cylinder 24. The pump cylinder member 22 is provided with a duct 40 communicating at one end with tthe closed end of the cylinder 24. The other end of the duct 40 is arranged was to be brought alternately into registry with the ports 36 and 38 upon oscillation of the member 22, whereby fluid may be supplied to and conducted away from the cylinder 24.

A second rotaryshaft 44 is journaled for rotation in the casing I6 and arranged parallel to the first mentioned shaft 28. Gears 46 and 48, the teeth of which mesh with each other, are fixed to the shafts 28 and 44, respectively, whereby such shafts are'interconnected for rotation to- 3 gether. The shaft 44 is hollow and one end thereof which is provided with parallel flat sides 50 projects into the chamber 20 and an eccentric 52 provided with a flat sided slot 54 is arranged in the chamber 29 and on the shaft 44 so as to be shiitable or adjustable transversely thereof, the flat sides 50 of the shaft 44 sliding within the flat sides of the slot 54 and so that upon rotation of the shaft 44, the eccentric 52 will gyrate or rotate therewith. A wedge member 55 in the form of a plunger is slidably arranged within the hollow shaft 44 for axial movement relative to the shaft 44. The plunger 56 and the shaft 44 are formed so that such parts cannot rotate relative to each other. The member 56' is provided with a wedge or cam surface 58 against which one end of an adjusting pin or member 60 is seated. The shaft 44 is slotted and the member 58 is slidably arranged in such slot in the shaft 44, the other I ber 55 and at its other end against one' end of the slot 54 in the eccentric 52. The spring 62 biases the eccentric offcenter relative to the axis of the shaft 44 while the wedge surface 53 of the plunger 56 cooperates with the pin 60 to move the eccentric 52 opposite to the direction in which it is biased by the spring 62, that is, upon movement of the plunger 56 to the left (Fig. 2), the wedge surface 58 will outwardly radially displace the member 60 and shift the eccentric 52 in a direction which will decrease the offcenter relation of the eccentric 52 relative to the axis of the shaft 44. In the position illustrated inFigs. 2 and 4,, the eccentric 52 is oifcenter relative to the axis of the shaft 44 and is in its position of maximum eccentricity. The'amount of eccentricity may be reduced by moving the center of the eccentric 52 toward the axis of the shaft 44 by means of movement of the plunger 58 to the left. Such movement of the plunger 55 may be effected by rotation of a screw 66 which is threaded in a threaded hole in the casing it, one end of the screw '68 being arranged to bear against one end of the plunger 56. The exposed end of the screw 66 is provided with a kerf 68 whereby a screwdriver may be applied to the screw 66 for turning the same.

An indicator dial it has its notched periphery meshing with notches in the exposed part of the screw 66 so as to turn therewith. Suitable marking may be applied to the indicator l0 and the casing so as to indicate the adjustment for which the metering pump is set. The indicator is journaled on a screw 12 threadedly secured to the casing and which may be tightened so as to lock I the screw 66 and the metering pump adjusting mechanism associated therewith in a set position. A spring 74 arranged in the hollow shaft 44 is confined between a pin 16 and one end of the plunger 58 for biasing the latter to the right and against the end Of the screw 66.

A strap 89 is journaled on the eccentric 52 and has a piston 82 fixed thereto. The piston 82 is arranged in the cylinder 24 and upon rotation of the shafts 28 and 44 with the parts arranged as illustrated, the piston is reciprocated and the cylinder member 22 gyrates in the chamber 48 so as alternately to bring the duct 49 into registry with the ports 36 and 38. The port 38 forms an outlet port while the port 33 forms an inlet port.

The cylinder member 22 oscillates or gyrates in the direction of the arrow shown in Fig. 4, while the eccentric 52 oscillates or gyrates in the direi: tion indicated by the arrow in Fig. 4 and opposite to the direction of motion of the member 22. With the parts of the metering pump assembled and adjusted as illustrated in Figs. 2 and 4, the pump is set so as to effect little or no pumping action as there will be little or no relative movement between the piston 82 and the cylinder 24 during the oscillation of the cylinder member 22 and the reciprocation of the piston 82. Adjustment of the eccentric 52 as previously described will increase the length of the stroke of the piston 82 in the cylinder 24. If the eccentric 52 is adjusted to the position of minimum eccentricity relative to the shaft 44 (coaxial therewith) the pump will be set to effect its maximum pumping action as the relative movement between the piston 82 and the cylinder will be at its maximum. It will be evident, however, that in this position, the piston 82 will not reciprocate but will merely rock or swivel about the axis of the shaft 44.

The surface 34 of the chamber I8 is a lapped surface and the face of the cylinder member 22 which oscillates against such surface 34 is biased into engagement therewith by means of a spring which reacts against the shoulder 92 on the shaft 28. A sealed face is thus maintained between the cylinder member 22 and the surface 34 and the gyrating motion of the member 22 provides a wiping of the seal face advantageous in maintaining a. lapped surface seal. In use, the metering pump is set to discharge oil in a predetermined volume to the nozzle assembly of the burner wherein it is intermixed with air under pressure delivered from the air pump it. nozzle as shown in the hereinbefore referred to Williams patent is adapted to mix the oil and air and to deliver such mixture in the form of an atomized spray. The pump I0 is arranged to be driven by the shaft 28 and includes a rotor I00 keyed to the shaft 23. Further details of the air pump I 0 are not considered to be necessary to an understanding of the invention claimed in this application, but for further information respecting the same, reference may be had to my aforesaid copending application.

The spring 90 is arranged in the cavity Hi2 and the other end of such spring reacts against a shaft seal indicated generally at 4.

The casing i6 is provided with cavities around the shafts 23 and 44 in which the gears 45 and 48 are arranged. The gear 45 is pinned to the shaft 2% for rotation therewith and the gear 48 is pinnedto the shaft 44 for rotation therewith by means of a pin '15 which forms a seat for one end of the spring l4. an oil suction pump. An inlet port H9 communicates with the pump cavities for supplying oil thereto and an outlet port I i2 communicates with the pump cavities for conducting oil under pressure therefrom, the discharge port I 22 being connected by suitable ducts formed in the casing to the metering pump inlet port 35. The gear pump 42 is arranged to draw oil out from a suitable reservoir and supply it under pressure to the metering pump E4. The metering pump 14 pumps metered quantities of oil to the nozzle of the burner.

As some oil may escape from the gear pump 12 around the shaft to the pump chambers I t and 26, a duct I I4 communicates at one end with the chambers 58 and 2D and at the other end with the inlet port H0 of the pump 12 so as to withdraw from the chambers 18 and 20 anyjoil that may escape into such chambers.

The

The gears 45 and 43 form v The casing I6 may-"comprise a plurality of cylinder blocks and end plates which are suitably formed and connected to them as illustrated to form a pump unit and the various ducts through which oil and air flow to and from the several pumps in the unit. The shaft 28 is arranged to be-driven by an electric motor. A pressure relief valve (not shown) may, as shown in my aforesaid copending application, be arranged between the discharge of the gear pump 12 and the inlet to the metering pump 14.

The fluid flow relationship between the gear pump shown in Fig. 3 and the metering pump shown in Fig. 4 is schematically illustrated by the dot and dash lines and the arrows associated therewith, from which it may be observed that the discharge port H2 of the gear pump is connected to the port 36 so as to supply fluid to the oil metering pump. The duct shown in dotted lines in Fig. 4 leading from the port H4 shows the arrangement by which the port H4 is connected to the inlet port H of the gear pump. The other ducts shown in dotted lines in Fig. 4 diagrammatically illustrate the manner in which oil may be supplied to the pump unit and the manner in which oil may be conducted from the port 38 to the exterior of the pump unit.

InFig. 6 the cylinder member 22 and the eccentric 52 are arranged in a different timed relation relative to each other than as shown in Fig. 4. In other words, while the position of the cylinder member 22 is the same as that shown in Fig. 4, the eccentric 52 is arranged 180 from that in which it is shown in Fig. 4. The relative arrangement of the parts as shown in Fig. 6 may be obtained during the assembly of the parts of the pump by positioning the parts as shown in Fig. 6 rather than as shown in Fig. 4.

The eccentric 52 as shown in Fig. 6 is in its maximum position of eccentricity relative to tkshaft 44. With the parts so arranged in Fig. 4, the pump is set so as to effect little or no pumping action, whereas with the parts arranged as illustrated in Fig. 6, the pump is set to obtain its maximum pumping action because as the piston 82 moves downwardly the cylinder 24 moves upwardly. With the parts of the pump arranged as illustrated in Fig. 6, adjustment of the eccentric 52 relative to the shaft 44 so as to decrease the eccentricity of the member 52 relative to the shaft 44 will decrease the stroke of the piston 82 and the output of the pump, and when the eccentric 52 is centered relative to the shaft, the output of the pump will be approximately one-half of that with the parts adjusted as shown in Fig. 6.

The pump parts as shown in Fig. 6 are the same as those shown in Fig. 4 except that in Fig. 6 the piston 52 is somewhat shorter than that shown in Fig. 4.- The minimum output of the pump assembled as shown in Fig. 6 is substantially the same as the maximum output of the pump assembled as shown in Fig. 4, and the adjustment of the eccentric 52 permits an adjustment of the pump assembled as shown in Fig. 4 from a maximum output which is approximately one-half of the maximum output of the pump assembly as shown in 6 down to approximately'zero output. In other words, by changing the timing of the eccentric 52 relative to the cylinder 22, the output of the pump may be doubled or cut in half, as the case may be, and in addition the adjustment provided makes it possible to accurately adjust the output of the pump'in each of its working ranges.

While I have illustrated and described a preferred embodiment of the invention, it is understood that this is capable of modification and I therefore do not wish to be limited to the precise details set forth but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

I claim:

1. Pump construction comprising a, casing defining a chamber, an oscillatable cylinder member having a cylinder therein and a laterally projecting stem arranged normal to the plane of said member and to the axis of said cylinder, a rotary shaft in said casing having a bore in which said stem is rotatably mounted, the axis of said bore being arranged parallel to but offset from the axis of said shaft, a surface of said chamber being provided with two spaced fluid flow ports. said cylinder member being provided with a duct communicating at one end with the closed end of said cylinder, the other end of said duct being arranged so as to be brought alternately into registry with said two ports upon oscillation of said member whereby fluid may be supplied to and expelled from said cylinder, a second rotary shaft arranged parallel to said first-mentioned shaft, gears interconnecting said shafts for rotation together, an eccentric adjustably mounted on said second shaft, a strap journalled on said eccentric, a piston recip-rocably arranged in said cylinder and connected to said strap, means for rotating said shafts so as to effect the oscillation of said cylinder member and the reciprocation of said piston .relative to said cylinder, said cylinder member and piston being correlated so that said duct will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston and means biasing said cylinder member against said surface, said ports being spaced so that said duct in said cylinder member cannot be in registry with both of said ports simultaneously and so that when the pump is not operating said arrangement, of said duct and ports will prevent fluid flow between said ports.

2. Pump construction according to claim 1 wherein said gears form working parts of a fluid pump, the outlet of which communicates with one of said ports whereby to supply fluid under pressure to said cylinder.

3. Pump construction according 'to claim 1 wherein said second shaft is hollow, a wedge member is axially slidably arranged in said hollow shaft, a movable member is arranged to be displaced by axial movement of said wedge member in one direction, said movable member upon displacement thereof being arranged to move said eccentric in one direction relative to the axis of said second shaft, and a spring is arranged to bias said eccentric in the opposite direction.

4. Pump construction comprising a casing defining a chamber, an oscillatable cylinder member having a cylinder therein and a laterally projecting stem arranged normal to the plane of said member and to the axis of said cylinder, a rotary shaft in said casing on which said stem is rotatably mounted, the axis of said stem being arranged parallel to but offset from the axis of said shaft, said chamber being provided with two spaced fluid flow ports, said cylinder being provided with duct means arranged so as to be brought into registry with said two ports upon oscillation of said member whereby fluid may be supplied to and expelled from said cylinder, a second rotary shaft, means interconnecting said shafts for rotation together, an eccentric mounted on said second shaft, a piston reciprocably arranged in said cylinder and connected to said eccentric so as to be reciprocated thereby upon rotation of said second shaft, and means for rotating said shafts so as to eifect the oscillation of said cylinder member and the reciprocation of said piston relative to said cylinder, said cylinder member and piston being correlated so that said duct means will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston.

5. Pump construction according to claim 4 wherein said second shaft is hollow, and means are arranged within said hollow shaft and in association with said eccentric for adjusting the eccentricity thereof relative to said second shaft.

6. Pump construction comprising a casing defining a chamber, an oscillatable cylinder member having a cylinder therein, said chamber being provided with two spaced fluidflow ports, said cylinder being provided with duct means arranged so as to be brought alternately into registry with said two ports upon oscillation of said member whereby fluid may be supplied to and expelled from said cylinder, a piston reciprocably arranged in said cylinder, means for effecting the oscillation of said cylinder member and the reciprocation of said piston relative to said cylinder, said cylinder member and piston being correlated so that said duct means will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston, said ports being spaced so that said duct means in said cylinder member cannot be in registry with both of said ports simultaneously and so that when the pump is not operating said arrangement of said duct means and ports will prevent fluid flow between said ports, means to supply fluid under pressure through one of said ports and said duct means to said cylinder, and a communication between said chamber and said supply means for removing from said chamber fluid which may escape from said ports and said duct means and cylinder into said chamber.

7. Pump construction comprising an oscillatable'and gyratory cylinder member having a cylinder therein, a rotary eccentric, a piston reciprocably arranged in said cylinder and connected to said eccentric so as to be reciprocated thereby upon rotationof said eccentric, drive means for effecting the oscillation and gyration of said cylinder member and the rotation of said eccentric to effect the reciprocation of said piston relative to said cylinder, and means for supplying fluid to said cylinder during the intake stroke of the piston and for conducting fluid from said cylinder during the discharge stroke of the piston, said drive means including gyrating motion producing mechanism connected to said cylinder member and operative by said drive means to effect gyration of said cylinder member upon operation of said drive means.

8. A metering pump comprising a member having a cylinder therein, said member being mounted for oscillatory and gyratory movement in a plane which includes the axis of said cylinder and about an axis normal to said cylinder axis, supporting means for said member providing a surface with which said member is in engagement, said surface being provided with two spaced'fluid flow ports, said member being provided with a duct communicating at one end with the closed end of said cylinder, the other end of said duct being arranged so as to be alternately brought into registry with said two ports in said surface upon oscillation and gyration of said member whereby fluid may be supplied to and expelled from said cylinder, a rotary shaft, a piston reciprocably arranged in said cylinder and eccentrically connected to said shaft and drive means for simultaneously rotating said shaft and oscillating and gyrating said member, said member and piston being correlated so that said duct will be in registry with one of said ports during the discharge stroke of the piston and in registry with the other of said ports during the intake stroke of the piston, said drive means including gyrating motion producing mechanism connected to said cylinder member and operative by said drive means to effect gyration of said cylinder member upon operation of said drive means.

9. Pump construction comprising a casing defining a chamber, an oscillatable and gyratory cylinder member having a cylinder therein, said chamber being provided with a surface having two spaced fluid flow ports and said cylinder member being arranged in said chamber, said cylinder member having duct means communicating at one end thereof with said cylinder and having the other end thereof arranged so as to be brought alternately into registry with said two ports upon oscillation and gyration of said member whereby fluid may be supplied to and expelled from said cylinder, means biasing said cylinder member against said surface, a piston arranged in said cylinder for reciprocation relative thereto, drive means for effecting the oscillation and gyration of said cylinder member where by said cylinder and piston will be relatively reciprocated so as to pump fluid, said cylinder member and piston being correlated so that said duct means will be in registry with one of said ports during the intake stroke of the piston and cylinder and in registry with the other of said ports during the discharge stroke of said piston and cylinder, said ports being spaced so that said duct means in said cylinder member will not be in registry with both of said ports simultaneously and so that when the pump is not operating the aforesaid arrangement of said duct means and ports will prevent fluid flow between said ports, said drive means for eifecting the gyration of said cylinder member including a shaft, the axis of which is arranged normal to the axis of said cylinder and piston and a thrust member arranged between said shaft and said cylinder member for effecting the gyration of said cylinder member, said thrust member being arranged off-center relative to the axis of said shaft.

10. A pump comprising a casing defining a chamber, said casing being provided with a surface having two spaced fluid flow ports, a cylinder member having a cylinder therein, said cylinder member being arranged in said chamber for oscillatory and gyratory movement in a plane which includes the axis of said cylinder and about an axis normal to said cylinder axis, means biasing said cylinder member against said surface, said cylinder member being provided with a duct communicating at one end with the closed end of said cylinder and terminating at its other end in the face of said member in engagement with said surface whereby upon oscillatory and gyratory movement of said cylinder member the outer end of said duct will be brought alternately inder member and piston being correlated so that said duct will be in registry with one of said ports during the discharge stroke of said cylinder and piston and in registry with the other'of said ports during the intake stroke of said cylinder and piston, said drive means including gyrating motion producing mechanism connected to said cylinder member and operative by said drive means to effect gyration of said cylinder member upon operation of said drive means.

11. Pump construction according to claim 10 wherein said means for effecting the oscillation and gyration of said cylinder member comprises a shaft arranged normal to the plane of rotation of said cylinder member and an eccentric drive between said shaft and said cylinder member.

12. Pump construction comprising a casing defining a chamber, a gyratory cylinder member having a cylinder therein and a laterally projecting stem arranged normal to the plane of said member and to the axis of said cylinder, a rotary shaft in said casing on which said stem is rotatably mounted, the axis of said stem bein arranged parallel to but offset from the axis of said shaft, said chamber being provided with two spaced fluid flow ports, said cylinder being provided with duct means arranged so as to be brought into registry with said two ports upon gyration of said member whereby fluid may be supplied to and expelled from said cylinder, a second rotary shaft arranged parallel to said first-mentioned shaft, means interconnecting said shafts for rotation together, an eccentric mounted on said second shaft, a piston reciprocably arranged in said cylinder and connected to said eccentric so as to be actuated thereby and means for rotating said shafts so as to effect the gyration of said cylinder member and the reciprocation of said piston relative to said cylinder, said cylinder member and piston being correlated so that said duct means will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston.

13. Pump construction comprising a casing defining a chamber, a gyratory cylinder member having a cylinder therein and a laterally projecting stem arranged normal to the plane of said member and to the axis of said cylinder, a rotary shaft in said casing on which said stem is rotatably mounted with the axis of said stem arranged parallel to but offset from the axis of said shaft,

a surface of said chamber being provided with two spaced fluid flow ports, said cylinder member being provided with a duct communicating at one end with said cylinder, the other end of said duct being arranged so as to be brought alternately into registry with said two ports upon gyration of said member whereby fluid may be supplied to and expelled from said cylinder, a sec ond rotary shaft connected with said first shaft for rotation therewith, an eccentric mounted on said second shaft, a strap journalled on said eccentric, a-piston arranged for reciprocation in said cylinder and connected to said strap, means for rotating said shafts so as to eifect the gyration of said cylinder member and the reciprocation of said piston relative to said cylinder, said cylinder member and piston being correlated so that said duct will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston, said ports being spaced so that said duct in said cylinder member cannot be in registry with both of said ports simultaneously and so that when the pump is not operating said arrangement of said duct and ports will'preve nt fluid flow between said ports. p

14. A metering pump comprising a casing defining a chamber, a gyratory cylinder member having a cylinder therein and arranged in said chamber, a rotary shaft in said casing having a connection with said cylinder member for gyrating said cylinder member about the axis of said shaft, a surface of said chamber being provided with two spaced fluid flow ports, said cylinder being provided with a duct communicating with said cylinder, said duct being arranged so as to be brought alternately into registry with said two ports upon gyration of said member whereby fluid may be supplied to and expelled from said cylinder, an eccentric connected in driven relation to said shaft so as to be rotated thereby, a strap journalled on said eccentric, a piston reciprocably arranged in said cylinder and connected to said strap so as to be reciprocated upon rotation of said eccentric, means for rotating said shaft so as to effect the gyration of said cylinder member and the reciprocation of said piston in and relative to said cylinder, said cylinder memberand piston being correlated so that said duct will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston.

15. A metering pump comprising a casing defining a chamber, a cylinder member having a cylinder therein and arranged in'said chamber, a rotary shaft in said casing connected to said cylinder member so as to gyrate the cylinder member, a surface of said chamber being provided with two spaced fluid flow ports, said cylinder being provided with a duct communicating with said cylinder, said duct being arranged so as to be brought alternately into registry with said two ports upon gyration of said member whereby fluid may be supplied to and expelled from said cylinder, a hollow rotary shaft arranged parallel to and driven by said first-mentioned shaft, an eccentric adjustably mounted on said second shaft, a strap journalled on said eccentric, an adjusting member for said eccentric arranged in said hollow shaft, a piston reciprocably arranged in said cylinder and connected to said strap, means for rotating said shafts so as to effect the gyration of said cylinder member and the reciprocation of said piston in and relative to said cylinder, said cylinder member and piston being correlated so thatsaid duct will be in registry with one of said ports'during they intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston.

16. A metering pump comprising a casing defining a chamber, a gyratory cylinder member having a cylinder therein and disposed in said chamber, a rotary shaft in said casing having a driving connection with said cylinder member for gyrating'the same about the axis of said shaft, a surface of said chamber being provided with two spaced fluid flow ports, said cylinder 11 being provided with a duct communicating with said cylinder, said duct being arranged so as to be brought alternately into registry with said two ports upon gyration'of said member whereby fluid may be supplied to and expelled from said cylinder, a second rotary shaft arranged parallel to said first-mentioned shaft, gears interconnecting said shafts for rotation together, an eccentric mounted on said second shaft, a piston reciprocably arranged in said cylinder and connected to said eccentric to be actuated thereby, means for rotating said shafts so as to effect the gyration of said cylinder member and the reciprocation of said piston relative to said cylinder, said cylinder member and piston being correlated so that said duct will be in registry with one of said ports during the intake stroke of the piston and in registry with the other of said ports during the discharge stroke of the piston.

17. Pump construction according to claim 16 wherein said gears form working parts of a fluid pump, the outlet of which communicates with one of said ports whereby to supply fluid under pressure to said cylinder.

18. Pump construction according to claim 16 wherein said gears form working parts of a fluid pump, the outlet of which communicates with one of said ports whereby to supply fluid under pressure to said cylinder, and a communication between said chamber and the inlet side of said fluid pump for removing from said chamber fluid which may escape from said ports and said duct and said cylinder into said chamber.

19. Pump construction for an oil burner comprising a chamber provided with a surface having spaced fluid ports therein, a cylinder member having a pumping cylinder therein and a face arranged in sliding relation on said surface, said cylinder member being disposed in said chamber, a piston arranged in said cylinder for reciprocation relative thereto, said cylinder member having a port in said face communicating with said cylinder and arranged so as to be brought alternately into registry with said ports in said surface whereby fluid may be supplied to and conducted from said cylinder, means operable for effecting sliding movement of said face of said cylinder memberv on said surface so as to bring said port in said face alternately into registry ,With said ports in said surface, said piston being V constructed and arranged so as to be reciprocated relative to said cylinder by and during operation of said means in order to draw fluid into said cylinder upon movement of the piston in one direction relative to the cylinder and to expel fluid fromsaid cylinder upon movement of said piston in the opposite direction relative to said cylin der, spring means reacting on said cylinder member thereby to bias the face thereof against said surface so as to yieldingly hold said face of said cylinder member in sealing engagement with said surface during the sliding movement of said face on said surface, and means providing a fluid communication between said chamber and said one of said ports in said surface through which fluid is supplied to said cylinder.

20. Pump construction for an oil burner C0211- prising a chamber provided with a surface having spaced fluid ports, therein, a cylinder mem" ber having a pumping cylinder therein and a face arranged to slide on said surface, said cylinder member being disposed in said cha fiber, a piston arranged in said cylinder for reciprocation relative thereto, said cylinder member having a port in said face communicating with said cylinder and arranged so as to be brought alternately into registry with said ports in said surface whereby fluid may be supplied to and conducted from said cylinder, a power driven rotary shaft having a connection with said cylinder member for effecting movement of said cylinder member so as to slide said face on said surface so as to bring said port in said face alternately into registry with said ports in said surface, said piston being constructed and arranged so as to be reciprocated relative to said cylinder by and during rotation of said shaft in order to draw fluid into said cylinder upon movement of the piston in one direction relative to the cylinder and to expel fluid from said cylinder upon movement of said piston in the opposite direction relative to said cylinder, a spring reacting on said shaft so as to bias the end of said shaft toward said cylinder member thereby to bias the face of said cylinder member against said surface so as to yieldingly hold said face of said cylinder member in sealing engagement with said surface, and means providing a fluid communication between said chamber and one of said ports in said surface.

21. Pump construction for an oil burner comprising a member provided with a surface having spaced fluid ports therein, a cylinder member having a pumping cylinder therein and a face arranged in sliding relation on said surface, said cylinder member being disposed in said chamber, a piston arranged in said cylinder for reciprocation relative thereto, said cylinder member having a port insaid face communicating with said cylinder and arranged so as to be brought alternately into registry with said ports in said surface whereby fluid may be supplied to and conducted from said cylinder, a power driven rotary shaft having a connection with said cylinder member for effecting movement of said cylinder member so as to slide said face on said surface so as to bring said port in said face alternately into registry with said ports in said surface, said piston being constructed and arranged so as to be reciprocated relative to said cylinder by and during rotation of said shaft in order to draw fluid into said cylinder upon movement of the piston relative to the cylinder in one direction and to expel fluid from said cylinder upon movement of said piston relative to said cylinder in the other direction, a spring reacting on said shaft so as to bias the end of said shaft toward said cylinder member and thereby to bias the face of said cylinder member against said surface so as to yieldingly hold said face of said cylinder member in sealing engagement with said surface, and a thrust member between the end of said shaft and said cylinder member and forming a part of the connection therebetween.

ROBERT R. WITHERELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,177,102 Berkshire Mar. 16, 1926 1,709,838 Carrey Apr. 23, 1929 1,934,755 Williams Nov. 14, 1933 2,293,675 Martin Aug. 18, 1942 2,484,920 Witherell Oct. 18, 1949 

